diff --git a/apps/web/src/pages/generate/components/Step4TitleSettings.tsx b/apps/web/src/pages/generate/components/Step4TitleSettings.tsx
index 184a27057..698dbe5d0 100644
--- a/apps/web/src/pages/generate/components/Step4TitleSettings.tsx
+++ b/apps/web/src/pages/generate/components/Step4TitleSettings.tsx
@@ -87,9 +87,9 @@ const Step4TitleSettings: React.FC<Step4TitleSettingsProps> = (props) => {
             <AutoComplete
               placeholder="输入或从标题库选择…"
               allowClear
+              maxLength={50}
               style={{ width: "100%" }}
               value={t.titleSettings.title || undefined}
-              onSelect={(val) => t.updateTitle(val || "")}
               onChange={(val) => t.updateTitle(val || "")}
               options={t.userTitles.map((ut) => ({
                 label: ut.content,